Licensed ADU Contractor · Statewide California
ADU Construction
Across California
TDQ Construction builds Accessory Dwelling Units throughout California — detached ADUs, garage conversions, Junior ADUs, and in-law suites. The only ADU contractor with Class A, B & C-18 authority to handle every phase in-house. Family-owned since 1967.
What Is an ADU?
California's Fastest-Growing Housing Solution
An Accessory Dwelling Unit (ADU) is a secondary residential unit built on the same lot as your primary home. In California, ADUs are one of the most strategic investments available to property owners — generating rental income, increasing property value, and providing flexible living space for family members.
California's ADU laws have expanded dramatically since 2020, making it easier than ever to build across the state. Reduced fees, streamlined permitting, and broader zoning approval mean your lot may qualify even if it previously didn't.
TDQ Construction has the licensing, field experience, and infrastructure knowledge to build your ADU correctly — from civil site preparation to final inspection. We serve all 123 California cities in our service area.
What We Build
Every ADU Type, Every City
Detached ADU
A fully independent structure on your existing lot — the most versatile and highest-value ADU option for rental income or multi-generational living.
Up to 1,200 sq ftGarage Conversion
Transform your existing attached or detached garage into a complete living unit. Lower civil costs, faster permitting, and minimal disruption to your property.
Existing footprintJunior ADU (JADU)
Contained within the walls of your existing home — an efficient, lower-cost option that still creates a self-sufficient living unit with its own entrance.
Up to 500 sq ftAttached ADU
An addition that shares a wall with the main structure — a strong middle-ground between a JADU and a fully detached unit, with more design flexibility.
Custom sizeRental Unit ADU
Fully rental-ready secondary units built to maximize long-term income — designed with tenants in mind from layout to utility separation.
Income-optimizedMulti-Gen Addition
A second primary suite or wing addition that integrates seamlessly with your existing structure — ideal for extended family without a separate address.
Custom scopeWhy Choose TDQ
The Only ADU Contractor with Class A Authority
Building an ADU in California requires more than a general contractor — it requires licensing authority to handle the civil and infrastructure components that most residential contractors cannot legally perform.
TDQ's Class A General Engineering license means we handle sewer laterals, utility connections, and site grading in-house — keeping your project on schedule under one accountable team.
Discuss Your ADU ProjectClass A Licensed — Civil Work Included
Most contractors cannot legally complete the civil and infrastructure components of an ADU — sewer laterals, utility tie-ins, site grading. TDQ holds a Class A General Engineering license, giving us full authority to handle every phase in-house.
One Contractor, Full Scope
From permits and foundation to framing, utilities, and final finishes — TDQ manages the entire project under one license. No coordination gaps, no finger-pointing between subs.
California ADU Law Experts
California ADU law has evolved significantly since 2020. We understand local permitting requirements, setback rules, impact fee exemptions, and utility connection standards across all California jurisdictions.
Family-Owned Since 1967
Our business runs on referrals. Every ADU we build is treated like our own property — because our reputation depends on it.
FAQs
Common ADU Questions
Every property is different. Call us to discuss your specific situation and lot.
(714) 357-1608Free Estimate
Ready to Start Your California ADU?
TDQ Construction provides detailed written estimates before any work begins. Select your city below or call us directly to discuss your property and project goals.
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Service Area
ADU Construction in Your City
Select your city below for local ADU regulations, pricing information, and a free estimate from TDQ Construction.
202 cities across California · Don't see yours? Call us — we serve all of California.